Shuttle threading and tension mechanism



July 20, 1943. L. PAVlA SHUTTLE THREADING AND TENSION MECHANISM Filed April 3, 1942 INVENTOR wrruzssgs T fjuigb fwvbcl/ gr M P i I ATTORNEYS Patented July 20, 1943 rimmomonno TENSEION MECHANISM Lu'i'gi ne Allentowm'la. Won mm; unseen No. 437,532 .s (61. 139-423):

- inventim-reie41es' to shuttlles; and particularly to shuttles of the automatic threadlug type having tension and take-up mechanism. Shuttles of this are particularly designed for use in looms using extremely fine-wetter filling which normally has a strong tendency to kink or snarl if it is allowed to become slack in the shuttle member during the weaving process.

An object of the invention is to provide a selfthreading shuttle which at all times will tension the thread but will allow its free movement through the shuttle.

In the accompanying drawing- Fig. 1 is a plan view of a shuttle embodying my invention;

Fig. 2 is a detail view partly in cross-section showing the thread-tensioning means;

Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is a cross-sectional View taken on the line 44 of Fig. 2;

Fig. 5 is a detail view of the outside of the shuttle eye.

The shuttle In is of the conventional type having a bobbin or quill H engaged by clainpii'lg means l2 and some soft material (such as fur) l3. My invention lies in the threading and tensioning mechanism mounted in a recess 44 in the forward part of the shuttle. The thread !5 passes from the quill through the thread passage !6 in which is mounted tensioning means I! consisting of two spring-pressed bearings which prevent the thread from snarling as it leaves the quill due to slackness. A threading slot or groove is provided in the outer end of the shuttle and a cover plate 21 covers the recess I 4 and is held in place by the screw 22 as well as by parts of the mechanism which will be described later. The cover plate 2| has a point 23 which frictionally engages the side 24 of the groove 20. The plate 2| also has a depending lug or guide 25 and has mounted therein a guide wire 26.

Mounted on the pin is a guide wire bent upon itself to form a bearing 3! and having one end 32 and one loop 33 positioned in the notch 34. For the purposes of description the entire guide will be identified by the numeral 35. It will be seen that in view of the pin 35and the notch 34, this guide is fixed and is not free to move.

Mounted on the pin 40 is another guide made of I wire bent upon itself to form the loop 4 I which is in turn bent upon itself to form a thread-guiding loop 42. At the end of the coil 43 an arm 45 extends into the recess and is engaged by "a ma berband H fastened to the pin it; rnsteadgot the rubber band 41, any suitable tensioning means :rnay "be used. V p At the side portion of the shoulder is the ye section 5%. A post 51 is-p'rovid'ed as a guide and an eye 52 is provided by bending Wire in the form of a loop 53 with an upstandingguide post 54 at one end and a U-shaped guide 55 terminating in the end 56 which is imbedded in the shuttle *to position the mechanism.

In threading the shuttle, the thread 15 is brought out into the threading groove 20 between the open top of the guide [1, is led through the space between the point 23 and the groove 20, and-is then brought rearwardly along the passage 60 around the post 54, looped around the guide 55 into the eye 52. While this is what ap pears from the exterior of the shuttle, the fact is that the thread is guided by the post 6| through the loop 42 across the guide 35 through the eye 52.

The post 6| is mounted in the plate 2| and engages a recess 63 in the shuttle. A recess 64 is also provided in the shuttle to position the guide 26. As the thread is moved through the passage 60, the guide 26 and the guide 35 position it so that it must go into the loop 42. Due to the action of the tension means 41, the loop 42 has a yieldingly downward pull and the operation is resisted by thetension of the thread being drawn through it. This will prevent any back-lash of the thread or any snarling when the drawing of the thread ceases, but will allow the thread to run freely'when the shuttle is operated; When the loop 42 is in the downward position the end 4| thereof is positioned in the recess 65 in the bottom of the plate 2 l.

I claim:

1. In a self-threading shuttle having a shuttle body with a forwardly extending thread passage formed therein and a lateral delivery passage, in combination, a fixed guide means and tension member pivoted at its forward end and having a laterally extending arm and an .elastic member engaging said arm adapted toyieldingly position the rear end of said tension member in a downward position.

2. A shuttle having a forward extending thread passage and a chamber in the forward part of said shuttle, a plate mounted over said chamber, a, guide post on said plate adjacent said thread passage, a depending guide on said plate, a fixed guide member in said chamber sloping rearwardly, a pivoted loop guide member in the forward 4. A shuttle having a forwardly extending thread passage and a chamber in the forward part of said shuttle communicating with said thread passage, a plate covering said chamber, a depending guide post on said plate adjacent said thread passage, a depending sloping guide on said plate, a fixed guide member having a plurality of arms sloping rearwardly in said chamber, a. pivoted loop guide member mounted in the forward part of said chamber and extending rearwardly, said pivoted loop guide member being adapted to cooperate with said fixed guide mem-' ber to tension said thread, said pivoted loop guide member having an arm extended laterally, and elastic means engagin said arm adapted to yieldingly hold said pivoted loop guide member in a rearward position.

5. In a shuttle having a chamber in the forward part thereof, tension means, said tension means including a fixed guide member having a plurality of sections sloping rearwardly and downwardly, a pivoted loop guide member mounted in the forward part of said chamber having a laterally extending arm, elastic means tending to tension said loop guide member downwardly around and between said fixed guide member,

and an eye in the side of said shuttle adjacent said guide members for the passage of thread.

6. A shuttle having a chamber in its forward .end and a thread passage to said chamber, said chamber having a sloping side wall, an eye in said side wall, tensioning mean in said chamber, said tensioning means including stationary guide means and a pivoted loop member having a. laterally extending arm, elastic means tensioning said loop means, a plate covering said chamber, fixed guide members on said plate, and 8. depending lug on said plate forming with said sloping side wall of said chamber a thread passage leading to said eye.

LUIGI PAVIA. 

